3com S7906E Guide De Référence

 

1-30 

System view 

2: System level 

instance instance-id: Configures the device as the root bridge in a particular MSTI. The value of 

instance-id ranges from 0 to 31. The minimum value is 0, representing the CIST. 

Use the stp root primary command to configure the current device as the root bridge.  

Use the undo stp root command to restore the system default.  

By default, a device is not a root bridge.  

Note that: 

z 

If you do not provide instance instance-id, your configuration will take effect in the CIST instance 

only.  

z 

There is only one root bridge in effect in an MSTI. If two or more devices have been designated to 

be root bridges of the same MSTI, MSTP will select the device with the lowest MAC address as the 

root bridge.  

z 

You can specify a root bridge for each MSTI without caring about the device priority. After 

specifying the current device as the root bridge or a secondary root bridge, you cannot change the 

priority of the device. 

# Specify the current device as the root bridge of MSTI 0.  

<Sysname> system-view 

[Sysname] stp instance 0 root primary 

stp [ instance instance-id ] root secondary 

undo stp [ instance instance-id ] root 

System view 

2: System level 

instance instance-id: Configures the device as a secondary root bridge in a particular MSTI. The value 

of instance-id ranges from 0 to 31. The minimum value is 0, representing the CIST.